单选题When configuring a multipoint GRE （mGRE） tunnel interface， which one of the following is NOT a valid configuration option：（）A tunnel sourceB tunnel destinationC tunnel keyD ip addressE tunnelvrf
单选题
When configuring a multipoint GRE （mGRE） tunnel interface， which one of the following is NOT a valid configuration option：（）
A
tunnel source
B
tunnel destination
C
tunnel key
D
ip address
E
tunnelvrf
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